//
// Created by Administrator on 2021/12/5.
//

#ifndef MARCHING_CUBES_NOISE_H
#define MARCHING_CUBES_NOISE_H

#include <cmath>

static const int perm[512] =
        {
                151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233,
                7, 225, 140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23,
                190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219,
                203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174,
                20, 125, 136, 171, 168, 68, 175, 74, 165, 71, 134, 139, 48, 27,
                166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230,
                220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54, 65, 25,
                63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169,
                200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173,
                186, 3, 64, 52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118,
                126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182,
                189, 28, 42, 223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163,
                70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19,
                98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104, 218, 246,
                97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162,
                241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181,
                199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150,
                254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128,
                195, 78, 66, 215, 61, 156, 180, 151, 160, 137, 91, 90, 15, 131,
                13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69,
                142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75,
                0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33,
                88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74,
                165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229,
                122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244,
                102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132,
                187, 208, 89, 18, 169, 200, 196, 135, 130, 116, 188, 159, 86,
                164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250, 124,
                123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59,
                227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213, 119,
                248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172,
                9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178,
                185, 112, 104, 218, 246, 97, 228, 251, 34, 242, 193, 238, 210,
                144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14, 239,
                107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176,
                115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114,
                67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180
        };

class Noise {
    static inline float quintic_smooth(float t);

    static inline float lerp(float a, float b, float t);

public:
    static inline float gradient(int hash, float x, float y, float z);

    static float get_value(float x, float y, float z);
};


#endif //MARCHING_CUBES_NOISE_H
